                         \begin{tabular}{l*{5}{c}} \hline \hline \noalign{\smallskip}                                         &                                          & \multicolumn{4}{c}{Incorporating college graduate quality} \\                                         \cmidrule(l){3-6}                                          &                                          & \multicolumn{1}{c}{Top 2\%}                                          & \multicolumn{1}{c}{Top 5\%}                                          & \multicolumn{1}{c}{Top 10\%}                                          & \multicolumn{1}{c}{Top 25\%}  \\ \hline                 
\noalign{\smallskip}
Log(gdppw)      &    0.694\sym{***}&    0.261         &    0.321         &    0.210         &    0.277         \\
                &  (0.198)         &  (0.217)         &  (0.241)         &  (0.229)         &  (0.215)         \\
[1em]
College graduate quality&                  &    1.480\sym{**} &    1.697\sym{**} &    2.266\sym{***}&    2.090\sym{***}\\
                &                  &  (0.579)         &  (0.664)         &  (0.625)         &  (0.609)         \\
\hline \noalign{\smallskip} 
Mean patents per thousands of persons&    0.602         &    0.433         &    0.551         &    0.594         &    0.602         \\
N               &       47         &       31         &       42         &       45         &       47         \\
R$^2$           &     0.21         &     0.34         &     0.32         &     0.41         &     0.38         \\
                         \hline \hline \noalign{\smallskip}                         \end{tabular}                 
